Figure 10:

Illustrative Case 3 (Patient 14). (a and b) Intraoperative findings during right suboccipital muscle dissection and exposure for the far lateral transcondylar approach. (b) The superior oblique (SO) and rectus capitis posterior major (RCPM) muscles were elevated. The third segment of the vertebral artery (blue, red, and yellow colors) was exposed. The blue color was covered by the SO, which included the lateral 68% of the third segment of the vertebral artery. The yellow color was covered by the RCPM, which included the medial 23% of the third segment of the vertebral artery. The red color was located within the center of the suboccipital triangle (asterisk).